First of all, keep in mind that the key to writing an essay is the ability to organize your thoughts in a logical order. Try not to make your thoughts fragmented. By starting your essay from the beginning, you will be able to make a cogent argument as well as providing supporting evidence to support your claims.
In case of a term paper, this means that you start with an introduction, describe the term, and then create a summary of the main points. You must not go on about what your major thesis is, since it might distract you from writing the other parts of the essay. Make sure that you give them enough time to come up with their own ideas.